Complete Kimchi -premium function

@@ -111,6 +111,10 @@ function compare_price(replyToken, message, upbitPrice){
                   {
                     "type":"text",
                     "text":"Upbit : "+String(upbitPrice)+"원"
+                  },
+                  {
+                    "type":"text",
+                    "text":"김치프리미엄 : "+String(((upbitPrice-binancePrice)/upbitPrice*100).toFixed(2))+"%"
                   }
                ]
           }